Auth bypass in Corewcf

CVE-2026-54781

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF SAML token validation does not enforce SubjectConfirmation method URIs or holder-of-key proof keys in SamlSecur…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

  • Corewcf — versions >= 1.9.0, < 1.9.1, < 1.8.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-54781?
CVE-2026-54781 is a high-severity vulnerability in Corewcf, classified under Improper Authentication. CVSS score: 7.4/10. Published 2026-07-08.
How severe is CVE-2026-54781?
High severity. CVSS v3 base score is 7.4 out of 10.